I have a 2013 Colnago Master. Last year, I noticed several small spots of rust on the chromed chainstays and seatstays. It’s not from chain slap because the spots are on both sides. I removed the rust with Rustoleum Rust Dissolver and it looked much better. This spring the rust has reappeared even though the bike has been in a dry garage all winter. There are no rust issues on the painted surfaces nor on the chrome fork, This leads me to believe there is something awry in how the frame was chromed. Sorry, but I didn’t think to take photo before cleaning off the rust again. Thoughts?